Our Jackie has put a smile firmly back on her West Coast hometown almost as wide as hers.

Greymouth's treasured X Factor finalist Jackie Thomas wowed a capacity crowd of about 900 at the small township's Regent Theatre this afternoon with crystal vocals that may well see her crowned winner on Monday night.

It's been more than four months since the 22-year-old singer-songwriter has visited Greymouth since her meteoric rise to fame began as one of 6000 hopefuls, singled out as a potential winner at her audition by judge Melanie Blatt.

She is the second of the TV3 show's finalists to sing at hometown concerts this week in advance of the two-day finale, which starts on Sunday night.